Product Overview: 3500/61 163179-02
The 3500/61 163179-02 is a critical monitoring module from the Bently Nevada 3500 Series, a globally recognized system for machinery condition monitoring and protection. Specifically, this part number identifies a Keyphasor® Input Module.
This module serves as the primary timing and speed reference for the entire monitoring system. It conditions the signal from a Keyphasor transducer (typically a proximity probe observing a keyway or mark on a shaft) to generate a once-per-revolt pulse. This pulse is essential for measuring rotational speed, phase angle for vibration analysis, and providing a synchronous trigger for other monitors in the rack (like vibration and position modules).
Its primary role is to enable accurate machinery diagnostics such as identifying imbalance, misalignment, and shaft cracks by providing a precise phase reference.
Key Parameters & Specifications
The following table details the typical specifications for a 3500/61 Keyphasor Module.
| Parameter Category | Specification | Remarks / Conditions |
|---|---|---|
| System & Part Number | 3500/61 163179-02 | Bently Nevada 3500 Series, Keyphasor Module, specific revision. |
| Form Factor | Single-Slot 3500 Series Module | Designed for installation in a 3500 rack. |
| Dimensions (H x W x D) | 193 mm x 43 mm x 205 mm (7.6" x 1.7" x 8.1") | Standard full-height module for 19-inch rack mounting. Depth includes connectors. |
| Weight | Approximately 0.68 kg (1.5 lbs) | Typical weight for an electronic module of this type. |
| Input Signal Type | -2 V to -22 V DC (from eddy current probe) or voltage pulse (from magnetic pickup). | Accepts signals from standard Keyphasor transducers. |
| Input Impedance | > 50 kΩ | High impedance to minimize loading on the signal source. |
| Speed Range | 0 to 30,000 RPM | Covers the operational range of most industrial rotating machinery. |
| Power Requirement | +24 VDC from 3500 rack backplane. | Powered through the system chassis. |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) | Standard industrial control room environment range. |
| Outputs | Keyphasor Pulse: TTL-compatible signal routed via backplane to other monitors. Buffered Transducer Signal: Available at front connector for diagnostic purposes. | |
| Front Panel Indicators | LEDs for Power, OK, Module Fault, and Signal Present. | Provides immediate health and status indication. |
| Compliance & Standards | CE, RoHS, ISO 9001, designed to meet API 670 (Machinery Protection Systems). | Compliant with major international quality and machinery protection standards. |
*Note: Exact specifications should be verified against the official Bently Nevada Datasheet for 3500/61-XX or the specific documentation for 163179-02.*
Primary Application Scenarios
Machinery Protection & Vibration Analysis:
Core Application: Installed in gas/steam turbines, compressors, pumps, fans, and motors in industries like Power Generation, Oil & Gas, and Petrochemicals.
Function: Provides the essential phase reference for vibration vectors (amplitude and phase), enabling accurate rotor balancing and diagnosis of faults like unbalance, misalignment, rotor rub, and loose parts.
Speed Measurement & Overspeed Protection:
Serves as the primary, reliable source for rotational speed (RPM) measurement. This speed signal can be used for control logic, start-up sequencing, and overspeed protection trip functions when integrated with a suitable control system.
Shaft Crack Detection & Torsional Monitoring (Advanced):
When used with specialized monitoring software and other vibration probes, the precise timing from the Keyphasor module is critical for detecting subtle changes in vibration phase, which can indicate the presence of a transverse shaft crack.
Predictive Maintenance Programs:
Forms the foundational timing component of a predictive maintenance strategy. Accurate phase data allows maintenance teams to trend machine health, plan interventions, and prevent catastrophic failures.
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